Modulation Out
(75 Ohm)
Modulation In
(75 Ohm)
24 VAC Power In,
50-60 Hz, 35W
Omnimount
25-STXMP
For Wall Mount
Omnimount
25-STXMP
For Ceiling Mount
Infrared Transmitter
Model WIR TX3
Williams Sound
®
Helping People Hear
Made in U.S.A.
Williams Sound Corp., Minneapolis, Minnesota, USA
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
WARNING: TO REDUCE THE RISK OF FIRE OR
ELECTRIC SHOCK DO NOT EXPOSE THIS
EQUIPMENT TO RAIN OR MOISTURE.
Power Supply Wiring:
Use NEC, Class 2 Wiring,
18 ga. Min
200 ft. Max. Length (18 ga.)
Modulation Signal Wiring:
Use RG59U Coax,
1000 ft. Max. Length
Internal Fuse:
1.25 A, 250V, 3AG
Note: It is normal for this unit
to feel warm while it is in
operation.
Williams Sound
®
Helping People Hear
TX3 Front
TX3 Rear
Fig. 3: TX3 Front & Rear
TX3 Transmitter
Power Input:
Two–screw terminal strip for low-voltage power
supply. 24VAC, 50 or 60Hz, 50VA. Each TX3
requires a separate power supply.
Power Indicator LED (front panel):
Located on the front panel in the center of the LED
window. Red indicator light glows when power is on
and the 95 kHz carrier is present.
NOTE: The TX3 shuts off when no 95 kHz carrier
is present.
Modulation In:
Connects to the Modulator Out jack of the MOD 1
modulator or another TX3 transmitter.
Modulation Out:
Connects to the Modulation In jack of of the next
TX3 transmitter in the chain when multiple
transmitters are used.
Mounting Bracket:
An omnidirectional mounting bracket is included
with the Transmitter. Positions are indicated for wall
and ceiling mounts. An optional tripod stand kit is
also available (WSC Part #SS-2).
Step 1: Infrared Transmitter
Set-Up
Selecting a Transmitter Mounting
Location
Rule 1:
The Williams Sound Infrared System
should not be installed outdoors or indoors
where there is considerable direct sunlight.
Sunlight generates infrared interference.
Certain types of high-efficiency
fluorescent lighting use 100kHz
modulation that can also interfere with
infrared systems.
Rule 2:
The most important principle to
understand when installing an infrared
system is that invisible infrared light
behaves just like visible light. It does not
pass through opaque objects like walls and
curtains and people. It does pass through
windows and door openings and it can
bounce and scatter off reflective walls,
floors, and ceilings. The IR transmitter
panels cannot be concealed or covered up.
The IR “eye” on the receiver unit cannot
be covered up and works best with a clear
line-of-sight to the transmitter panel(s).
Rule 3:
If you are not getting sufficient coverage
with a properly installed transmitter panel,
you need to add one or more additional
transmitter panels.
Williams Sound
®
Helping People Hear
6
